The NikeACG Mountain Fly 2 Low is built for an adventure. This trail-ready silhouette has been updated withan extended toe cap and mountain-tough rubber sidewalls, finished with abreathable upper that helps keep you from overheating and lets you air out quickly when wet. Nike ACG Mountain Fly 2 Low - Mesh upper - Semi-gusseted tongue - Lace toggle - Extended toecap - Rubber sidewalls - Foam midsole.